NPR Covers "Rock Snot"

“Serious fly fishermen may remember 2007 as the year that the invasive species known as ‘rock snot’ turned into a national problem. For at a least decade, nasty carpets of this algae have been fouling up pristine fishing streams in the western United States. Then, last summer, it turned up in fishing streams in several eastern states.” NPR reporter John Nielson offers an update and overview of the didymo problem, along with excellent photos of the invasive algae.